Arbor-press.



No. 734,866. Patented Dec. 2, I902.

F. H. COLVIN.

ARBOR PRESS.

(Application filed Sept. 20, 1901.)

(Jo Model.)

rlilag! In in UNirEn STATES PATENT OFFICE.v

FRED I-I. COLVIN, OF EAST ORANGE, NEW JERSEY.

ARBOR-PRESS.

SPECIFICATION forming part of Letters Patent No. 714,866, dated December 2, 1902. Application filed September 20, 1901. Serial No. 75,729- (No model.)

To all whom, it may concern:

Be it known that I, FRED H. COLVIN, a citizen of the United States, residing at East Orange, in the county of Essex and State of New Jersey, haveinvented certain new and useful Improvements in Arbor-Presses; and I do doclare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

My invention relates to arbor-presses for driving mandrels and the like, and has for its objects, among others, to provide a simple but powerful press adapted to be operated by hand in which the movement of the ram or plunger may be readily regulated and which is adapted to support arbors of diiferent sizes with out the use of outside levers or other mechanism.

\Vith these objects in view my invention consistsin the construction hereinafter shown and described.

Referring to the drawings, Figure 1 is a side elevation of a press embodying my invention. Fig. 2 is a front view of the same. Fig. 3 is a side view, partly in section, of a work-support provided with means for adjusting its position; and Fig. 4 is a sectionalview on line 5 5 of Fig. 4.

In the construction shown in Figs. 1 and 2 A designates the frame of the press, which is of usual construction, having the base A, provided with an open-sided throat and adapted to be bolted or otherwise secured to a suitable support, and the overhanging arm A having the vertical opening. A therethrough. Through the opening A slides the rain or plunger B, having its lower end B adapted to drive the mandrel-key or other work to be driven. On one or more of the faces of this overhanging arm A preferably on the front face, as shown, is provided a rack R, which may be formed integral with the arm or on a separate piece secured to the arm. The teeth 4' of this rack are preferably of ratchet form, as shown, having their lower faces preferably curved upward, so as to afford a firm hold for the engaging tooth or hook of the operating device hereinafter described.

being The operating device consists of a lever L, having a downwardly-extending arm T, provided at its lower end with a hook 25, adapted to engage the teeth 4 of the rack R. A bar T is pivoted to the lever L and has at its upper end a laterally-projecting arm resting on the upper end of the ram or plunger B, to which it is pivoted at t. The baris also provided at its lower end with an arm or handle L, preferably formed integral therewith and extending forward, as shown in Fig. 1, directly above the lever L, but at a slight angle thereto, as shown.

In operation the arbor is on the base A, together with the mandrel to be driven. A downward movement of the lever L will pull down the bar T and force the ram or plunger downward, forcing the face of the plunger against the mandrel and driving it to position. The extent of the downward movement of the ram or plunger will be determined by the position of the tooth or hook t on the rack R. By lifting the lever L, as by grasping the lever L and the arm or handle L together, the tooth orhook may be lifted out of engagement with the rack, and by moving placed in position the plunger up or down, as desired, and releasing the lever L the tooth or hook may be caused to engage the rack at any point desired.

Any convenient means for returning the ram or plunger to position may be employed. I have shown for this purpose a counterbalance-weight W, connected bya lever W and link W to the ram or plunger, the lever W pivoted to the frame, as shown.

In the construction which I have shown in Figs. 3 and 4 the machine is made self-supporting-that is, its frame extends downward to the floorand is provided with an adjustable work support or knee K, arranged to slide on the frame A. This knee or support is held to the frame in any convenient manneras, for instance, by means of bolts K, secured to the support near its upper end and passing through slots K in the frame. The

upright web of the support is preferably double, as shown, and on this web I arrange a lebetween the pork, which passes The inner end is adapted to engage a rack ver K secured, preferably, tions of the web by a pin through a slot 70 in the lever. of this lever K ICO R on the frame of the machine. On the upright web of the support is also pivoted, either on the pin it, as shown, or on a separate pivot, a detent-pawl K arranged to engage the rack R and having a weighted end to keep it normally in engagement with the rack. The lever K may be swung on its pivot-pin k to cause it to engage with a tooth of the rack. When so engaged, by raising the outer end of the lever the work-support will be raised as required, the support being prevented from downward movement by the detent-pawl K If desired, the support may be connected by means of a rope or chain K and pulley K with a counterbalance-Weight K Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a press, the combination of a frame, a plunger movable therein, a rack'on one of said members, and means for operating the plunger comprising a lever having its end formed to engage a tooth of the rack and a bar pivoted to the lever and to the member not carrying the rack and having a handle thereon, the handle and lever being so arranged that by pressing them together the hooked end of the latter may be withdrawn from engagement with the rack.

2. In a press, the combination of a frame, a plunger movable therein, a rack on one of said members, and means for operating the plunger comprising a lever having its end formed to engage a tooth of the rack and a bar pivoted to the lever and to the member not carrying the rack and having a handle thereon, the handle and lever being so arranged that by pressing them together the hooked end of the latter may be withdrawn from engagement with the rack, and means for automatically returning the plunger to the position for operation.

In testimony whereof I affix my signature in presence of two witnesses.

FRED H. COLVIN. Witnesses:

F. M. Scocrr, J AS. R. PATERSON. 

